Billionaire Stewart fills his converted passenger jet with priceless art and sets off to Palm Beach for a museum opening, joined by an uninvited gang of hijackers. Twist to this in-flight disaster is that the bad time in the air occurs underwater, a novel (and some might say, desperate) twist to the old panic in the plane we're all gonna die formula. With a cast of familiar faces, some of them stars and some of them just familiar faces, this is yet another sequel to "Airport" and another boxoffice success, leading to the last of the tired series in 1979.